Hardness of water can be detected using:

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Scum formed by lathering soap

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Dilute

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Zn-Cu couple

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Solution

The correct option is B
Scum formed by lathering soap

Soap in general, can be taken to be Sodium Stearate. When soap is used with water it forms lather. If $C a^{2 +}$ or $M g^{2 +}$ ions are present in water (hardness) they tend to form scum with soap and as a result lather formed is lower than that compared to soft water. Hence option (b) is the right answer.

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Hardness of water can be detected by using:

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